Door opener



FIG. 1 is a bottom perspective view of the door opener showing the present design in position of use;

FIG. 2 is a bottom view thereof,

FIG. 3 is a front view thereof,

FIG. 4 is a rear view thereof,

FIG. 5 is a right view thereof,

FIG. 6 is a left view thereof; and,

FIG. 7 is a top view thereof. 

The ornamental design for a door opener, as shown and described. 